Mephistopheles wa Dare?

On the eve of her wedding, Nanako Marina's world shatters when she discovers her fiancé in the arms of another woman. Devastated and betrayed just hours before she was meant to walk down the aisle, she is left reeling from a heartbreak that threatens to consume her entirely. In her darkest moment of despair, an unexpected encounter alters the course of her life forever. A priest who crosses her path by chance leans in close and whispers a chilling proposition, addressing her as a "lost sheep" and urging her to exact revenge upon the man who wronged her. This mysterious clergyman, however, is far from a simple servant of the church. He reveals himself to be a two-faced messenger of God, harboring secrets beneath his holy vestments. Drawn into his unsettling orbit, Nanako is thrust into a dangerous new reality where divine guidance and dark temptation blur together. As she grapples with her shattered trust and the intoxicating promise of vengeance, she must navigate the treacherous path laid out before her. With this enigmatic figure whispering in her ear, the question remains: what will become of Nanako now that she has crossed paths with a being who defies the very faith he represents?